256层CT在冠状动脉CTA中的应用-课件幻灯

1、Application of 256-slice CT in coronary CTAApplication of 256-slice CT in coronary CTA2CTA with Reduced Radiation DoseCTA with high heart rateReduced Radiation Dose364-slice:15-20mSv - 7501000 Chest film4Reduced Radiation DoseReported effective radiation dosage in recent studies with the use of 64de

2、tector row CT have ranged from 9.5 to 21.4 mSv, more than the previously reported d-oses from 16detector row CT studies.James P, Elise L, Bruce A, et al. Prospectively Gated Transverse Coronary CT Angiography versus Retrospectively Gated Helical Technique: Improved Image Quality and Reduced Radiatio

3、n Dose. Radiology 2021;246:742-75316-detector64-detector256-detectorMore doseage？More doseage5Reduced Radiation Dose530-46%12-24%17-33%80%3 multipleDoseWise proved New32-40%6Reduced Radiation DoseRetrospectively ECG-triggered scanProspectively ECG-triggered scanProspectively gated transverse CT tech

4、nique represents an 83% reduction as compared with that for the group with the retrospectively gated helical technique。James P, Elise L, Bruce A, et al. Prospectively Gated Transverse Coronary CT Angiography versus Retrospectively Gated Helical Technique: Improved Image Quality and Reduced Radiation

5、 Dose. Radiology 2021;246:742-7537Reduced Radiation Dose7Larger coverage:80 mmFor a typical cardiac scan (120 mm)Two axial shots3 Heart beats4-5 second scansLess vulnerability to irregularity / arrhythmiaMore reliable performance in scan after scanStep & Shoot Cardiac scan1Step:23256slice320sliceRed

6、uced Radiation Dose a b c d e Dose reduction up to 40%图像区SpiralOverscanReduced Radiation Dose10Patient: CT检查时条件设置 Xiong shu yan ,woman,46Height:162mm,Weight：52KGBMI：Symptom：chest painRadiation doseCTDIvolCase of low dose-Prospectively ECG-Gated5 Chest films11Case of low dose-prorospectively ECG-Gate

7、dCPR of LAD12Case of high heart rate-Retrospectively ECG-GatedCPR of LCX and RCA13Reduced Radiation DoseHoe J, Toh KH. J Cardiovasc Comput Tomog. 2021;3:257-261.Prospective 320-slice scanning14High heart rate14Air Propelled Ferry Hovercraft OperationCompressed Air Cushion lifts the ferry above sea l

8、evel and a conventional motor moves it forward 0.27S 15High heart rateHoe J, Toh KH. J Cardiovasc Comput Tomog. 2021;3:257-261.Scan acquisition parameters with 256-slice MDCTHeart rateExposure controlExposure phase windowData recomstruction mode1782-heart beat scan10% to end of R-R interval4-segment

9、 reconstruction16Patient Parameters of CT scan Ceng wen,femal,47 years.symptom： discomfort in the chest Case of high heart rate-Retrospectively ECG-GatedWeight：55KGHeight：160mm BMI：17Case of high heart rate-Retrospectively ECG-GatedCPR of RCA18Case of high heart rate-Retrospectively ECG-GatedMPR of

10、RCA and CT value19Case of high heart rate-Retrospectively ECG-GatedCPR of LADCPR of LCXCPR of DCPR of PDA20Patient Parameters of CT scan Liu hui zhen,femal,57 years.symptom： discomfort in the chest Case of high heart rate-Prospectively ECG-GatedWeight：58KGHeight：164cm BMI：21Case of high heart rate-Prospectively ECG-GatedCPR of LCX22Case of high he